you said you wanted cheap.
the general rule, and I find that many if not most issues default to this, is you get what you pay for (hopefully).
for my $$$, the inexpensive lens of my choice is canon's 1.8 stm. not perfect, and not an overall fave, but for an inexpensive 50...
while I have yet to justify canon's discontinued legends: the ef 50/1.0 or the ltm 50/0.95 (no compatible bodies), my current faves for ~50mm lenses are:
the canon 50/1.2L - quirks and all,
an EF mount modified minolta rokkor 58/1.2 manual focus, and
a fuji x-trans zeiss touit 32/1.8 planar - autofocus, w/ff-fov 48mm.
honorable mentions:
the canon 50/2.5 compact macro w/life size converter,
an aus Jena DDR T 50/2.8 - CZJ Tessar, manual focus, and its optical clone
the Zenitar Helios 44M-6 58mm f/2 MC, tessar copy, manual focus
so, starting with the $25 yongnuo, I've listed 8 lenses in the ~50mm range - 7 in ef compatible mounts. I could easily suggest any number of additional honorable mentions.
canon is long overdue in their perpetually rumored overhaul of their 50mm lineup. who knows?
good luck with your search.
every year I tell myself that it's time to cull my crop of 50's, and every year seems to end with more 50's on the shelves.